Doubleclick on the Text Highlighter by SparkleStock.atn file.
Go to the Actions panel (Window > Actions).
Select an action then click on the play button on the bottom of the Actions panel.
If you see the "No Pixels are selected" Error?" error message, checkmark the "Never Show Again" option. The actions use this to detect your text height.
Tips
The actions are only compatible with Photoshop CC.
The "Fluid Width" action works best with capitalized text and without any punctuation marks.
For faster playback, ensure that the actions are collapsed (not showing the steps). You can also switch to button mode by going to the Actions panel menu (Top-Right of the panel) and selecting Button Mode.
You can type extra spaces to to manipulate the shape of the text. For example, typing extra spaces before and after a line of text will create wider highlights. You can also add spaces above and below your text. However, this may interfer with the "Fluid Width" actions.
To create spacing above and below the "Fluid Width" highlight, go to the Characters panel (Window > Character) and set the Leading to around 2x the font size. The Leading setting is beside the Text Size setting.